下列哪种静脉麻醉药最易引起喉痉挛（）
A.氯胺酮
B.硫喷妥钠
C.丙泊酚
D.咪达唑仑
E.依托咪酯
参考答案：B
My uncle _____ the Party in 1986. He _____ for over 20 years. [ ]
A. joined, has been a Party member
B. joined, has joined the Party
C. has joined, has joined the Party
D. has joined, has been in the Party
破碎机选用的三角带的型号是（）.
